U.S. patent number 4,477,270 [Application Number 06/432,347] was granted by the patent office on 1984-10-16 for air filter.
Invention is credited to Franz Tauch.
United States Patent |
4,477,270 |
Tauch |
October 16, 1984 |
Air filter
Abstract
An air filter providing a filter chamber comprising an open core
cage of activated charcoal wrapped by a first polyurethane foam pad
of a predetermined density, all of which is covered by a second
polyurethane filter blanket of a different density. The center bore
of the chamber being unobstructed and having communication at one
end with an air blower that evacuates the core, drawing ambient air
therein through 360 degrees and exhausting filtered air
therefrom.
Inventors: |
Tauch; Franz (Palatine,
IL) |
Family
ID: |
23715761 |
Appl.
No.: |
06/432,347 |
Filed: |
January 7, 1983 |
Current U.S.
Class: |
96/140; 55/318;
55/413; 55/472; 55/485; 55/486; 55/492 |
Current CPC
Class: |
B01D
46/0024 (20130101); B01D 46/0036 (20130101); B01D
46/24 (20130101); B01D 2273/30 (20130101); B01D
2265/06 (20130101); B01D 2267/40 (20130101) |
Current International
Class: |
B01D
46/24 (20060101); B01D 050/00 () |
Field of
Search: |
;55/316,318,469,471,472,485,486,487,492,510,528,529,DIG.13,410,413,414,467 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lacey; David L.
Claims
Having thus described the invention, what I claim as new and desire
to secure by Letters Patent is:
1. A filter for purifying air having a plurality of filter stages
comprising:
(a) a frame means having an open center core having opposite open
ends,
(b) means for sealing one of said open ends of said center
core,
(c) cage means mounted on said frame within said center core for
holding a granular filter material,
(d) a granular filter material contained within said cage
means,
(e) a first filter blanket, wrapped around the exterior of said
cage means and having a pre-determined density,
(f) a second filter blanket having a lesser density covering said
first filter blanket,
(g) an air diffuser mounted on said frame at its remaining open end
and having communication with said center core, and
(h) an air evacuating means within said air diffuser for evacuating
air from within said center core through said open end of said
frame means so as to create a vacuum within said center core which
will be filled by filtered air drawn through said filter elements
through a 360.degree. plane.
2. A filter for purifying air as defined by claim 1, wherein said
grandular filter material comprises a quantity of activated
charcoal retained within said cage means surrounding said center
core of said frame.
3. A filter for purifying air as defined by claim 1, wherein said
first filter blanket is a polyurethane foam having a density of 80
ppi. and the second filter blanket comprises a polyurethane foam
having a density of 45 ppi.
4. A filter for purifying air as defined by claim 3, wherein said
grandular filter material comprises a quantity of activated
charcoal retained within said cage means surrounding said center
core of said frame means.
5. A filter for purifying air as defined by claim 1 wherein said
cage means comprises spaced apart walls formed from a suitable wire
mesh extending about said open center core.
6. A filter for purifying air as defined by claim 5, wherein said
grandular filter material comprises a quantity of activated
charcoal retained within said cage means surrounding said center
core of said frame means.
7. A filter for purifying air as defined by claim 5, wherein said
first filter blanket is a polyurethane foam having a density of 80
ppi., and the second filter blanket comprises a polyurethane foam
having a density of 45 ppi.
8. A filter for purifying air as defined by claim 1, wherein said
air evacuating means comprises a blower adapted to evacuate air
from within said center core and exhausting the same through said
air diffuser.
Description
SUMMARY OF THE INVENTION
It is an object of this invention to provide an air filter that is
highly efficient in use, economical to manufacture, and simple to
maintain.
Another object of the invention is to provide an air filter which
draws polluted ambient air through a full 360 degree area
surrounding an open core. The unit will evacuate the center of the
open core creating a pressure differential attracting polluted air
through the filtering walls and exhaust the purified air through
the base of the unit.
The air filter of the present invention consists of a circular
frame which provides a cage for activated charcoal. The charcoal
cage is first wrapped by a polyurethane foam blanket which in turn
is wrapped by an outer polyurethane foam blanket having a density
different from that of the first blanket.
The filtering properties and characteristics of polyurethane foam
is well known in the art, and together with its low resistance to
air transmission with the ability to absorb twice its own weight in
contaminants makes the two-stage filtering of this invention highly
efficient in use.
The air filter of the present invention utilizes a vacuum system
which functions together with atmospheric pressure, and
electromotive forces to draw contaminated air through the
three-stage filter of the unit through the use of a minimal amount
of energy, all of which is a direct result of the air diffuser and
blower assembly incorporated in this invention.
Other objects of this invention will be apparent from the
description hereinafter incorporated in this specification.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be best understood by reference to the
accompanying drawings showing the preferred form of the embodiment
by which the stated objects of the invention are achieved, and in
which:
FIG. 1 is a side elevational perspective view of the filter unit of
this invention;
FIG. 2 is a side elevational perspective view of the internal frame
of the filter unit
FIG. 3 is an enlarged detailed sectional view of the three-stage
filter system of this invention;
FIG. 4 is a fragmentary detailed sectional view of the air diffuser
and blower assembly as employed in this invention; and
FIG. 5 is a top plan sectional view taken on lines 5--5 of FIG.
4.
GENERAL DESCRIPTION
The air filter of this invention is designed and constructed so
that it may be housed in either a vertical or horizontal exterior
cabinet. As the design of the cabinet is merely incidental to the
invention, it is not shown in the drawings or described in the
definition of the invention.
The air filter 10 of the invention is shown in a vertical
displacement in FIG. 1.
The air filter 10 consists of an internal frame 11 having elongated
standards 12, all of which are joined together by circular top and
bottom rings 13 and 14 respectively. The construction of the frame
11 is designed to provide an open center core 15 defined by a wall
of screening 16 attached to the inner wall surface of the standards
12 and connecting rings 13 and 14, see FIGS. 3 and 4.
A like circular wall of screening 17 is fastened about an outer
periphery of the frame 11 forming, together with the inner screen
wall 16, an open cage 18 for retaining a quantity of activated
charcoal 19. The activated charcoal comprises one filter stage of
the three-stage filters of this invention.
An elongated connector strip 20 overlays the outer screen wall 17
and extends between the top and bottom rings 13 and 14 and lies
adjacent one of the standards 12 as shown in FIG. 3.
This connector strip 20 provides a series of vertical staggered
pins 21 extending radially with respect to the center core 15, as
well as a plurality of threaded bolts 22. Adapted to be impinged
upon the pins 21 are the mating edges of a blanket of polyurethane
23 having a density of approximately 80 ppi.
Adapted to encase the charcoal cage 18, as well as the polyurethane
blanket 23, is a second blanket 24 of polyurethane having a density
of approximately 45 ppi.
The threaded bolts 22 are of a length so as to project outwardly of
the blanket 24 and receive a closure strip 25 which covers the
mating edges of the blanket 24 and retain the same in their
designated position relative to the frame 11. By a series of
fasteners such as nuts 26 the strip 25 is secured in place.
The top ring 13 is provided with a circular sealing gasket 27,
which, together with a circular cover 28, will effectively seal the
top of the center core 15. The cover 28 may be fastened to the ring
13 by any suitable means, such as screws or the like.
Mounted upon the bottom ring 14 exteriorly of the frame 11 is an
air diffusing shield 29. This shield may be connected to the bottom
ring 14 by any suitable fasteners such as by screws 30 as shown in
FIG. 4. The shield 29 provides a circular opening 31 which is of a
diameter slightly less than that of the ring 14 and is positioned
so as to have open communication with the center core 15. Across
the top of the opening 31 of the shield 29 are a pair of mounting
bars 32 which, in turn, support therefrom, in a depending fashion,
within the shield 29, an air blower 33.
When the air filter unit 10 is positioned within its receptacle,
the shield 29 will be in an elevated position so as to have open
communication with the surrounding atmosphere. When the blower 33
is activated it will evacuate the air within the center core 15
creating a vacuum therein which, in turn, will be force filled by
ambient air surrounding the filter 10. This ambient polluted air
will be filtered as it is drawn through the three-stage filters of
the unit into the center core 15 and exhausted as cleansed and
purified air through the diffuser shield 29.
By creating a vacuum within the center core 15, which is sought to
be filled by the ambient atmosphere entering through 360.degree. ,
the air movement is powerful enough to draw the contaminated air
through each successive increased density of the three-stage
filters consisting of the outer foam blanket 24, the inner foam
blanket 23, and the activated charcoal 19. The air contaminants are
readily trapped and filtered by this arrangement resulting in an
efficient and economical air purification operation.
While I have illustrated and described the preferred form of
construction for carrying my invention into effect, this is capable
of variation and modification without departing from the spirit of
the invention. I, therefore, do not wish to be limited to the
precise details of construction as set forth, but desire to avail
myself of such variations and modifications as come within the
scope of the appended claims.
* * * * *